Investments (Tables)

6 Months Ended

Jun. 25, 2022

Amortized Cost and Fair Value of Available-for-Sale Investments

The amortized cost and fair values of available-for-sale investments are as follows at June 25, 2022 and December 25, 2021 (in thousands):     

			Gross		Gross
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
June 25, 2022
Money market investments	$	25,368	$	—	$	—	$	25,368
Asset-backed securities		20,504		—		2,135		18,369
Corporate bonds and direct obligations of
government agencies		124,513		29		7,104		117,438
U.S. Treasury obligations		2,342		—		62		2,280
Total	$	172,727	$	29	$	9,301	$	163,455
December 25, 2021
Money market investments	$	8,750	$	—	$	—	$	8,750
Asset-backed securities		22,441		—		346		22,095
Corporate bonds and direct obligations of
government agencies		137,916		1,406		966		138,356
U.S. Treasury obligations		2,342		50		—		2,392
Total	$	171,449	$	1,456	$	1,312	$	171,593

Schedule of Unrealized Loss on Available-for-Sale Investments

For those available-for-sale investments with unrealized losses at June 25, 2022 and December 25, 2021, the following table summarizes the duration of the unrealized loss (in thousands):

	Less than 12 months				12 months or longer				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
June 25, 2022
Asset-backed securities	$	18,369	$	2,135	$	—	$	—	$	18,369	$	2,135
Corporate bonds and direct obligations of government agencies		90,412		5,659		15,412		1,445		105,824		7,104
U.S. Treasury obligations		2,280		62		—		—		2,280		62
Total	$	111,061	$	7,856	$	15,412	$	1,445	$	126,473	$	9,301
December 25, 2021
Asset-backed securities	$	22,095	$	346	$	—	$	—	$	22,095	$	346
Corporate bonds and direct obligations of government agencies		72,526		966		—		—		72,526		966
Total	$	94,621	$	1,312	$	—	$	—	$	94,621	$	1,312